Spring加载xml文件错误异常：Offending resource: class path resource [spring-context.xml];

很少写单纯的java工程，在运行的时候，加载xml文件的时候报错，在此记录错误信息，备自己以后查阅，错误信息如下：

Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
log4j:WARN File option not set for appender [error].
log4j:WARN Are you using FileAppender instead of ConsoleAppender?
log4j:ERROR Either File or DatePattern options are not set for appender [error].
log4j:WARN File option not set for appender [DEBUG].
log4j:WARN Are you using FileAppender instead of ConsoleAppender?
log4j:ERROR Either File or DatePattern options are not set for appender [DEBUG].
2017-10-10-18-43 [main] [org.springframework.context.support.ClassPathXmlApplicationContext] [INFO] - Refreshingorg.springframework.context.support.ClassPathXmlApplicationContext@57fa26b7: startup date [Tue Oct 10 18:43:15 CST 2017]; root of context hierarchy
     log4j:ERROR No output stream or file set for the appender named [DEBUG].
2017-10-10-18-43 [main] [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] [INFO] - Loading XML bean definitions from class path resource [spring-context.xml]
     2017-10-10-18-43 [main] [org.springframework.beans.factory.xml.XmlBeanDefinitionReader] [INFO] - Loading XML bean definitions from class path resource [spring-mongodb.xml]
     org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Failed to import bean definitions from URL location [classpath:spring-mongodb.xml]
Offending resource: class path resource [spring-context.xml]; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [spring-mongodb.xml]; nested exception is java.lang.IllegalArgumentException: ResourceLoader must not be null
at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:70)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:76)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:235)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseDefaultElement(DefaultBeanDefinitionDocumentReader.java:186)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:171)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:144)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:100)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:510)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:188)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:252)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:127)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:93)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:614)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:515)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.ai.core.start.Main.main(Main.java:25)
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [spring-mongodb.xml]; nested exception is java.lang.IllegalArgumentException: ResourceLoader must not be null
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:414)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:336)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:304)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:181)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:217)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.importBeanDefinitionResource(DefaultBeanDefinitionDocumentReader.java:229)
... 20 more
Caused by: java.lang.IllegalArgumentException: ResourceLoader must not be null
at org.springframework.util.Assert.notNull(Assert.java:115)
at org.springframework.core.io.support.ResourcePatternUtils.getResourcePatternResolver(ResourcePatternUtils.java:62)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.setResourceLoader(ClassPathScanningCandidateComponentProvider.java:238)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.<init>(ClassPathScanningCandidateComponentProvider.java:127)
at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.<init>(ClassPathScanningCandidateComponentProvider.java:110)
at org.springframework.data.mongodb.config.MappingMongoConverterParser.getInititalEntityClasses(MappingMongoConverterParser.java:304)
at org.springframework.data.mongodb.config.MappingMongoConverterParser.potentiallyCreateMappingContext(MappingMongoConverterParser.java:203)
at org.springframework.data.mongodb.config.MappingMongoConverterParser.parse(MappingMongoConverterParser.java:99)
at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:74)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1427)
at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1417)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:174)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.doRegisterBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:144)
at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:100)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:510)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:392)

开始遇到此问题，想偷懒直接上网上查一下，看看是否能解决，发现说的都对，但是没有解决我的错误，所以就跟踪源码

XmlBeanDefinitionReader
   MappingMongoConverterParser
   ClassPathScanningCandidateComponentProvider
   ResourcePatternUtils

一步步跟踪到public abstract class AbstractRefreshableConfigApplicationContext extends AbstractRefreshableApplicationContext
implements BeanNameAware, InitializingBean这个类下面的次方法

public void setConfigLocations(String[] locations) {
  if (locations != null) {
   Assert.noNullElements(locations, "Config locations must not be null");
   this.configLocations = new String[locations.length];
   for (int i = 0; i < locations.length; i++) {
    this.configLocations[i] = resolvePath(locations[i]).trim();
   }
  }
  else {
   this.configLocations = null;
  }
}

然后在找到最后的入口：

public class ClassPathXmlApplicationContext extends AbstractXmlApplicationContext这个类的这个方法

public ClassPathXmlApplicationContext(String[] configLocations, boolean refresh, ApplicationContext parent)
throws BeansException {

super(parent);
  setConfigLocations(configLocations);
  if (refresh) {
   refresh();
  }
}

发现String[] configLocations这个参数，是个数组，由于非web工程在加载的时候，需要把所有的xml保存到容器中，然后才能互相引用，所以首先一次性全部加载到容器中，放在上下文环境在main函数中修改为：

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"classpath:/*.xml"});

注意：属性文件例如jdbc.properties里面的配置尽量写在xml文件中，如果必须要写在.properties文件，也应该把其放在同一个上下文环境中。不然就要放在xml中

在Eclipse环境中正常运行，当把jar放到测试环境，运行还是依然报错。此时把所有的spring版本都更新到最高版本，结果正常。可能存在版本不兼容的问题导致。

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Spring加载xml文件错误异常：Offending resource: class path resource [spring-context.xml];

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